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146 lines
3.3 KiB
146 lines
3.3 KiB
/**************************************************************************
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*hlp_locate - locate line in help text
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*
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* Copyright <C> 1988, Microsoft Corporation
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*
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* Purpose:
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*
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* Revision History:
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*
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* 17-OCt-1990 RJSA translated to C
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* 25-Jan-1990 LN renamed to hlp_locate
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* 22-Dec-1988 LN Removed MASM High Level Lang support (Need
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* to control segments better than that will
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* let me)
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* 08-Dec-1988 LN CSEG
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* [] 18-Aug-1988 LN Created
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*
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*
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**************************************************************************/
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#include <stdio.h>
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#if defined (OS2)
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#define INCL_BASE
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#include <os2.h>
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#else
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#include <windows.h>
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#endif
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#include <help.h>
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#include <helpfile.h>
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#include <helpsys.h>
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/**** hlp_locate - locate a line in the buffer
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* uchar far * near pascal hlp_locate(
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* ushort ln,
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* uchar far *pTopic
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* )
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*
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* Purpose:
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* commonly used routine to find a line in the topic text.
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*
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* Entry:
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* ln = 1 based line number to look for (-1 means return number
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* of lines in topic)
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* pTopic = Topic text to look for it in
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*
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* Exit:
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* returns pointer to start of line
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*
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* Exceptions:
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* returns NULL on not found
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*
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**************************************************************************/
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PCHAR pascal
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hlp_locate (
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SHORT ln,
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PCHAR pTopic
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){
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struct topichdr UNALIGNED *pT = (struct topichdr *)pTopic;
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PBYTE pSrc = (PBYTE)pTopic;
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SHORT lnOrig = ln;
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if (pT->lnCur <= (USHORT)ln) {
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// Use last past position calculated
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ln -= (pT->lnCur );
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pSrc += pT->lnOff;
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} else {
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// Start from beginning
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pSrc += sizeof(struct topichdr);
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}
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if (pT->ftype & FTCOMPRESSED) {
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// Compressed file. Walk over each text\attribute pair
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// until the desired line is found.
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while ( *pSrc && ln) {
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pSrc += *pSrc;
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pSrc += *(USHORT UNALIGNED *)pSrc;
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if ( *pSrc && *(pSrc+1) != pT->linChar ) {
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ln--;
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}
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}
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//while (*pSrc && ln) {
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//
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// if (*(pSrc + 1) != pT->linChar) {
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// ln--;
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// }
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// pSrc += *pSrc;
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// pSrc += *(PUSHORT)pSrc;
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//}
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} else {
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// ASCII file
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while (*pSrc && ln) {
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if (*pSrc != pT->linChar) {
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ln--;
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}
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while (*pSrc && *pSrc != 0x0A) {
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pSrc++;
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}
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if (*pSrc)
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pSrc++;
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}
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}
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if (*pSrc) {
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// Line found. Update the topic hdr with the pointers to the text
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// and line number that we just found, to help speed us up next time.
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pT->lnOff = (USHORT)((PBYTE)pSrc - (PBYTE)pT);
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pT->lnCur = lnOrig;
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} else {
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//
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// Line not found. Update nothing and return NULL
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// (Side Effect: line requested (ln) - line count left (ln) is the
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// number of lines in the topic! If original ln is -1, we'll return
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// that instead!
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if (lnOrig == -1)
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pSrc = (PBYTE)IntToPtr(lnOrig - ln);
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else
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pSrc = (PBYTE)0L;
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}
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return pSrc;
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}
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